Steam boilee



(No Model.) 2 Sheets-Sheet 1.

W. SAUR.

STEAM BOILER.

Patented May 29, 1894.

2 b e e h S S t e e h S 2 RI U 0 AB Mv A W T S (No Mo No. 520,742.Patented May 29, 1894.

UNITED PATENT OFFICE.

WILLIAM SAUR, OF IVASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR, BY

DIRECT AND MESNE ASSIGNMENTS, OF TVVO-THIRDS TO GEORGE H. HAM- MER,WILLIAM II. YEATMAN, AND JACOB J. BECK, OF SAME PLACE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 520,742, dated May 29,1894. Application filed February 7, 189 Serial No. 499,394- (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM SAUR, a citizen of the United States,residing at Washington, in the Districtbf Columbia, have in- 5 ventedcertain new and useful Improvements in Steam-Boilers; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itapperl tains to make and use the same.

As is well known the brick walls of the furnaces'or fire boxes of steamboilers require to be frequently rebuilt owing to the intense heat towhich they are subjected burning r them out. Aside from the expenseattached to the rebuilding of the walls the owners or users of theboilers are frequently caused great inconvenience and, often seriousloss by reason of the loss of the use of the boiler while cooling offpreparatory to rebuilding and during the time necessarily occupied inrebuilding. Beside the objections just noted to. the use of masonry forthe purpose named a further objection exists in that the masonry absorbsa large proportion of the heat generated in the furnace, which heat iswasted and serves no useful purpose whatever and is frequently the causeof injury to the boiler shell when the boiler is blown off before thewalls of the furnace and setting of the boiler have cooled downsufficiently. 7

Now, it is the object of my invention to provide a casing or setting forsteam boilers which is more durable than brick and not so 5 liable to beinjured by the heat, and in which the heat now wasted on the masonry maybe utilized to heat large quantities of water for use in the boiler orfor other purposes, as in laundries, or factories requiring heated water0 in large quantities, without the use of additional fuel, the water soheated being at the same time greatly purified.

With these objects in view my invention consists in providing a hollowmetal casing- 5 adapted to cover and protect the boiler and to form thewalls of the furnace or fire box, the sides of said casing beingconnected by a hollow bridge, a hollow dead plate, and a hollow returnplate or diaphragm, whereby a free and uninterrupted flow or circulationof wa- 5o ter may be maintained throughout the casing at all times, allof which will be more fully hereinafter described and claimed.

In the accompanying drawings forming a part of this specificationFigure1 is a lon- 5 gitudinal vertical section through a boiler provided withmy improved casing; Fig. 2 a perspective detail view showingtheconnection between the return plate and casing; Fig. 3 a frontelevation of theboiler; and Fig. 4 a vertical cross section on the line:Jcx, Fig. 1.

Similar letters referto similar parts throughout the several views.

Referring to the drawings A represents the 5 boiler, proper, which isprovided with the tubes Band steam dome C as is usual. The fire box orfurnace is arranged as usual directly below the boiler and its gratebars rest at one end on the bridge D and at the other end on the hollowdead plate E, and the products of combustion pass first along the underside of the boiler to its end and are returned forward through the tubesB to the front of the boiler and then over the top thereof to the smokestack F at the rear. The casing G within and onwhich the boiler rests oris supported consists of metal plates cast in the desired form andrigidly secured together to form a water tight reservoir inde- 8opendent of the boiler and forming a jacket or. setting therefor. In thepresent instance I have shown the jacket or casing as extending theentire length of and slightly beyond the rear end of the boiler at itssides, said casing being connected at its rear end by a hollow diaphragmor return plate H which is bent at right angles at its upper end andattached or rests against the rear end of the boiler so as to directtheproducts of combustion into the tubes B. Thediaphragm or return plateserves to brace and strengthen the sides of the casing and does notextend quite to the bottom of the combustion chamber I, sufficient spacebeing left below it to provide 5 for the cleaning of the combustionchamber through a door or manhole a at the rear end of the casing. Thecasing extends over and across the top of the boiler and back to thesteam dome and is fitted or connected to an extension piece, J, whichextends back to the smoke stack and forms a cover for the rear end ofthe top of the boiler. The hollow bridge D is formed of metal and iscurved on its upper surface to conform to the shape of the boiler andis, preferably, of greater area than the ordinary bridge and extendsback farther into the combustion chamber and communicates at each endwith the hollow side walls of the casing. While the bridge may be madeso as to extend to the floor of the furnace I prefer to make it of lessdepth than this would require and support it on a brick wall K, asshown. At its front the casing is hollow throughout, that portionthereof which extends down on each side of the doors of the furnacebeing connected by the transverse hollow dead plate E, so that theboiler, and fire box or furnace is completely surrounded by a hollowcovering or casing which takes the place of the ordinary brick settingtherefor. The boiler rests on the side walls of the casing at b, and theplates forming the walls of the casing are held together and braced bymeans of bolts 0 which pass through tubes d arranged between the platesand are headed over at the outside of the walls as shown in Fig. 4. Thewater is fed to the casing at the front end thereof at the top, anautomatic float or other valve, 6, being employed to control theadmission of the water thereto. A suitable glass gage, f, is alsomounted at the front end of the casing so that the height of the waterin the casing may be ascertained at a glance. Near the bottom of thefront end of the casing hand holes, g, are formed and suitable covers ordoors provided therefor through which access may be had to the bottom ofthe casing to clean out the same. I also provide suitable injectors orpumps for the casing whereby the water heated in said casing may be fedto the boiler or conducted or drawn off to be used for other purposes.

From the above description it will be understood that the mud or otherheavy impurities contained in the water will settle at the front andalong the bottom of the casing at the sides and may be readily removedtherefrom through the doors or openings g at the front of the casing,thus enabling me to feed a comparatively pure water to the boiler, thuslessening the liability of the boiler becoming incrusted. Also as Iprovide a complete water covering for the boiler and furnace it isevident that the heat playing on the walls of the cover or casing willhave less injurious effect thereon as the water filling the casing willconstantly change or circulate therein so as to present at all times tothe heated interior wall of the casing a body of water of lesstemperature than the heated wall itself, thereby utilizing the heatheretofore wasted and at the same time rendering the setting moredurable.

Having thus described my invention, what 1 claim as new, and desire tosecure by Letters Patent, is-

1. A steam boiler and furnace setting or covering, consisting of ahollow metal casing independent of said boiler and fire box andnon-communicatin g therewith adapted to surround the boiler and fire boxand to be filled with water, substantially as described.

2. A casing or setting for steam boilers and furnaces, consisting ofhollow metal covering or top, and rear and front walls all communicatingwith each other and independent of the boiler, adapted to be filled withwater, substantially as described.

A casing or setting for steam boilers, consisting of a hollow metalcasing independent of and surrounding the boiler and fire box, a hollowdead plate, a hollow bridge anda hollow return plate all communicatingwith said casing, substantially as described.

In testimony whereof I affix my signatu re in presence of two witnesses.

NV. SAUR.

Witnesses:

W. H. YEATMAN, G. ll. HAMMER.

